The edge of the blade is made from High Speed Steel, which is much harder than standard carbon steel, and hasbeen shown to last up to 3x longer in user trials on plasterboard / drywalling, roofing, insulation, flooring and other heavy-duty materials

The bulk of the blade is made from spring steel, which can resist pressure applied from the side without snapping

The safest blade in use, is generally a sharp one it takes less effort to cut, and therefore greater control can be maintained